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Submission + - Mark Russinovich about Vista network slowdown 1

koro666 writes: In his latest blog post, Mark Russinovich analyzes the network slowdown experienced by some users when playing multimedia content. "Tests of MMCSS during Vista development showed that [...] heavy network traffic can cause enough long-running DPCs to prevent playback threads from keeping up with their media streaming requirements, resulting in glitching. MMCSS' glitch-resistant mechanisms were therefore extended to include throttling of network activity. It does so by issuing a command to the NDIS device driver [...] [to] pass along, at most 10 packets per millisecond (10,000 packets per second)."

Be careful when a loop exits to the same place from side and bottom.